Note: This timeline will be updated when Between the Lines: Set 4 is completed; historical inaccuracies are abound, so please try to suspend some disbelief there.
PRE-SERIES 1: 1911 - 1977
1. Climb Every Mountain (1911)
2. Alfred Goes Flying (1947)
3. Better Safe Than Sorry (1948)
4. Master of the Railway: Part 1 (1949-1951)
5. Master of the Railway: Part 2 (main events in 1951; ends in 2000)
6. Mine Over Matter (1955)
7. Parliamentary, My Dear Albert (1957)
8. Hold Your Horses (1957)
9. Coffee on the Go (1959)
10. Nose Stuck in a Book (1966)
11. A Precious Gift (begins in 1967, ends in 1973)
SERIES 1-4: 1978 - 1986
12. Slipping and Sliding (1978)
13. Fish Out of Water (begins in 1976, ends in 1979)
14. Why So Blue? (1979)
15. Percy and the Blue Wheel (1980)
16. From Ffarquhar with Love (1980)
17. Count Your Chocolates Before They Melt (1980)
18. Whistling Wilfred (1980)
19. Quarrelsome Coaches (1981)
20. Coal Mine Decline (1982)
21. Breaking Couplings (begins in 1982, ends in 1984)
22. Henry Runs Hot (1985)
23. Skarloey's Secret (present day events in 1985; flashback events in 1887)
24. Rusty Saves the Day (1986)
25. Lauren and the Old Coaches (1986)
26. Not So Famous Engines (1986)
SERIES 5-7: 1986 - 1994
27. Branch Line Blues (1988)
28. The Railway Connection (1988)
29. Duck's Demons (1988)
30. Trouble on the Train (1990)
31. Skarloey the Big Engine (present day events in 1990; flashback events in 1972)
32. A Kyndley Gesture (1991)
33. If the Roller Fits (1992)
34. Inside My Heart (begins in 1988, ends in 1992)
35. Trespassers (1993)
36. Alone in the Shed (1994)
37. Diesels and Bluebells (1994)
SERIES 8-16: 1994 - 2002
38. Trouble at the Crossing (1994)
39. Caroline's New Friend (1995)
40. When Falcons Cry (1996)
41. The Mystery of Misery (1997)
42. Molly's Roundup (1999)
43. Who's Clarence? (2000)
44. Sodor Super Hero Engines (2002)
SERIES 17-18: 2003 - 2005
45. The Lion and the Antelope (2003)
46. Doncaster Delivery (2003)
47. Two Yellow Engines (prologue in 2002; main events in 2003)
48. Precision and Perfection (2003)
49. Life on the Slow Lane (2003)
50. Toby's Fundraiser (2003)
51. It Don't Come Easy (2004)
52. Given the Slip (2004)
53. Emily's Coach Trouble (2004)
54. Thomas, Between the Lines (flashback events 1916-1979; epilogue in 1994; present-day events in 2004)
55. Gator's White Christmas (2004)
56. Blind Puffing (2005)
SERIES 19-21: 2005 - 2009
57. Very Wee Engines (2005)
58. Pardon My French (2005)
59. Riddle Me This (2005)
60. Engines of the Night (2005)
61. Hardened Frost (2005)
62. Overconfidence and Misunderstandings (2006)
63. Henry and the Ghost Ship (2006)
64. Take Me Seriously (2006)
65. Every Dog Has Its Day (2006)
66. Gordon in a Sulk (2006)
67. Sir Handel Spoils the Washing (2006)
68. Return of an Old Foe (2006)
69. A Special Friend for Duck (2006)
70. Frieda on the Rails Again (2007)
71. Oliver's Lobster Surprise (2007)
72. Brake on Me (2007)
73. Know Your Limits (2008)
74. Rosie and the Runaway Horse (2008)
75. The Quarryman's Coach (2008)
76. Philip and the Troublesome Twins (2008)
77. BoCo's New Driver (2008)
78. Out of the Blue (2008)
79. Miracle at Arlesburgh Junction (2008)
80. Scarlett Red (2009)
